I finally got around to making my own RGB (auto switching) SCART lead last night and it works a treat!

The problem is, the screen has a blue tint to the picture (the boot up screen is blue instead of purple). I know it's not the new SCART lead because it's the same through the composite lead. The revelation came from when I forced the SCART lead up which then gave me a perfect picture. I can't remember if I bought it like that or whether I messed it up.